libpcap: fix pcap-config

pcap-config as installed is using OS paths instead of OpenWrt ones.

Take fix from libpng and adjust as needed.

This problem seems to occur on Arch Linux and not on Debian/Fedora
based distros. No idea why.

Remove CMAKE_INSTALL as there is now an InstallDev section.

Signed-off-by: Rosen Penev <[email protected]>

package/libs/libpcap/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libpcap
 PKG_VERSION:=1.9.1
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://www.us.tcpdump.org/release/ \
@@ -18,7 +18,6 @@ PKG_HASH:=635237637c5b619bcceba91900666b64d56ecb7be63f298f601ec786ce087094
 
 PKG_MAINTAINER:=Felix Fietkau <[email protected]>
 
-CMAKE_INSTALL:=1
 PKG_ASLR_PIE_REGULAR:=1
 PKG_BUILD_PARALLEL:=1
 
@@ -71,6 +70,15 @@ CMAKE_OPTIONS += $(if $(CONFIG_PCAP_HAS_NETFILTER) ,,-DPCAP_SUPPORT_NETFILTER=OF
 
 CMAKE_OPTIONS += $(if $(CONFIG_IPV6),-DINET6=ON,-DINET6=OFF)
 
+define Build/InstallDev
+	$(call Build/InstallDev/cmake,$(1))
+	$(SED) \
+		's,^\(prefix\|exec_prefix\)=.*,\1=$(STAGING_DIR)/usr,g' \
+		$(1)/usr/bin/pcap-config
+	$(INSTALL_DIR) $(2)/bin
+	$(LN) ../../usr/bin/pcap-config $(2)/bin/pcap-config
+endef
+
 define Package/libpcap/install
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libpcap.so.* $(1)/usr/lib/